nymaim | b23ebc7d342d01f97d509f1f785bd3c9abd5a0de7f04574bf23130f2309bb752

Analysis

max time kernel
91s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
02/12/2022, 04:32

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General

Target
file.exe
Size 2.1MB
Sample221202-e5zwmsde96
SHA256 b23ebc7d342d01f97d509f1f785bd3c9abd5a0de7f04574bf23130f2309bb752
MD5 a4bca4ab1b1e7172e19bec55759f43b6
SHA1 3d12d89ee076e7909cf929aec0ffd88d7cbd3f53
SHA512 ea4e2d68a958213f790920b3ec1fd1149e47a7688e10fef9e47c079a864453f9b6f7fc05a80b5f9f14de4163baa61c0cb3dc9a1ace15dfcd29c94cb51508f135
SSDEEP 49152:8engFs7YRTfLlMEh7h1EpRqV9Vuhrptylk7kX4dbB5mBMDAG5cy5:8DFjRTfZMih1EfYn+0lk7kXaB50YXcy5
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

nymaim discovery trojan

Malware Config

Extracted

Family

nymaim

45.139.105.171
85.31.46.167

Signatures

NyMaim
NyMaim is a malware with various capabilities written in C++ and first seen in 2013.
trojan nymaim

Executes dropped EXE 3 IoCs

pid	Process
2260	is-4FLAO.tmp
4356	PrintFolders.exe
3220	iBO0xNt6IBMRJR.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	PrintFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
2260	is-4FLAO.tmp

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Drops file in Program Files directory 9 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\PrintFolders\PrintFolders.exe	is-4FLAO.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-4FLAO.tmp
File created	C:\Program Files (x86)\PrintFolders\is-LRGP2.tmp	is-4FLAO.tmp
File created	C:\Program Files (x86)\PrintFolders\is-9H075.tmp	is-4FLAO.tmp
File created	C:\Program Files (x86)\PrintFolders\is-H9NLN.tmp	is-4FLAO.tmp
File created	C:\Program Files (x86)\PrintFolders\is-PM1HM.tmp	is-4FLAO.tmp
File created	C:\Program Files (x86)\PrintFolders\is-8ABER.tmp	is-4FLAO.tmp
File created	C:\Program Files (x86)\PrintFolders\is-UUETJ.tmp	is-4FLAO.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-4FLAO.tmp

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Kills process with taskkill 1 IoCs

evasion

pid	Process
3608	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4356	PrintFolders.exe
4356	PrintFolders.exe
4356	PrintFolders.exe
4356	PrintFolders.exe
4356	PrintFolders.exe
4356	PrintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3608	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 5060 wrote to memory of 2260	5060	file.exe	81
PID 5060 wrote to memory of 2260	5060	file.exe	81
PID 5060 wrote to memory of 2260	5060	file.exe	81
PID 2260 wrote to memory of 4356	2260	is-4FLAO.tmp	82
PID 2260 wrote to memory of 4356	2260	is-4FLAO.tmp	82
PID 2260 wrote to memory of 4356	2260	is-4FLAO.tmp	82
PID 4356 wrote to memory of 3220	4356	PrintFolders.exe	83
PID 4356 wrote to memory of 3220	4356	PrintFolders.exe	83
PID 4356 wrote to memory of 3220	4356	PrintFolders.exe	83
PID 4356 wrote to memory of 3432	4356	PrintFolders.exe	91
PID 4356 wrote to memory of 3432	4356	PrintFolders.exe	91
PID 4356 wrote to memory of 3432	4356	PrintFolders.exe	91
PID 3432 wrote to memory of 3608	3432	cmd.exe	93
PID 3432 wrote to memory of 3608	3432	cmd.exe	93
PID 3432 wrote to memory of 3608	3432	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:5060
- C:\Users\Admin\AppData\Local\Temp\is-V9Q9O.tmp\is-4FLAO.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-V9Q9O.tmp\is-4FLAO.tmp" /SL4 $70034 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1961811 51712
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:2260
- - C:\Program Files (x86)\PrintFolders\PrintFolders.exe
    "C:\Program Files (x86)\PrintFolders\PrintFolders.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:4356
  - - C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\iBO0xNt6IBMRJR.exe
      4⤵
      Executes dropped EXE
      PID:3220
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "PrintFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\PrintFolders.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3432
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PrintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:3608

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 3.3MB
SHA256 d72a6767657eca417eeedc307cd914ab6505fa38e52eab96002b80a1cabbb609
MD5 fde816f115d6b2bf4683ba4c6c08cac3
SHA1 d8974ea18cda8b31491f131dab76f1714457ee5d
SHA512 f395c435bae9db6576ce368ff0b89453146a0cd56c39c30358d37a334b0b7b4291637f874b45426108998055385a4d4fe486208e46fdb5b9363951732da7e3f3
SSDEEP 49152:Y0iELw173qbnDMuH1ue3Ek3GWTxXKFZNBOG:Y0te73IDMcMVOGWTxXKFZNBOG
MD5 SHA1 SHA512 SSDEEP

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PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 3.3MB
SHA256 d72a6767657eca417eeedc307cd914ab6505fa38e52eab96002b80a1cabbb609
MD5 fde816f115d6b2bf4683ba4c6c08cac3
SHA1 d8974ea18cda8b31491f131dab76f1714457ee5d
SHA512 f395c435bae9db6576ce368ff0b89453146a0cd56c39c30358d37a334b0b7b4291637f874b45426108998055385a4d4fe486208e46fdb5b9363951732da7e3f3
SSDEEP 49152:Y0iELw173qbnDMuH1ue3Ek3GWTxXKFZNBOG:Y0te73IDMcMVOGWTxXKFZNBOG
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-ISVEP.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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is-4FLAO.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-V9Q9O.tmp\is-4FLAO.tmp
Size 643KB
SHA256 b5cd942dd7019c1cda1715e4ce942094c41ad1e7bc7c5f63fe3ab7d97bc5a021
MD5 363a4d2aa5d6cf5cbb2267cccf0c4436
SHA1 a4cdb756698ed28f522956166a6292e9e309dd9c
SHA512 b5929be6e258a63557f376b50a40f6d465cbd372a88e7dcae7944faacb9181cd55873f52dee99cee2e3705596b3b55cb6f784db800f5a32f06e63b9ead3e7c70
SSDEEP 12288:Jh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv4xp:f5NoqWolrP837JzHvA6yknyWFxv4xp
MD5 SHA1 SHA512 SSDEEP

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is-4FLAO.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-V9Q9O.tmp\is-4FLAO.tmp
Size 643KB
SHA256 b5cd942dd7019c1cda1715e4ce942094c41ad1e7bc7c5f63fe3ab7d97bc5a021
MD5 363a4d2aa5d6cf5cbb2267cccf0c4436
SHA1 a4cdb756698ed28f522956166a6292e9e309dd9c
SHA512 b5929be6e258a63557f376b50a40f6d465cbd372a88e7dcae7944faacb9181cd55873f52dee99cee2e3705596b3b55cb6f784db800f5a32f06e63b9ead3e7c70
SSDEEP 12288:Jh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv4xp:f5NoqWolrP837JzHvA6yknyWFxv4xp
MD5 SHA1 SHA512 SSDEEP

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iBO0xNt6IBMRJR.exe

Path C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\iBO0xNt6IBMRJR.exe
Size 72KB
SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
MD5 3fb36cb0b7172e5298d2992d42984d06
SHA1 439827777df4a337cbb9fa4a4640d0d3fa1738b7
SHA512 6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c
SSDEEP 1536:bvUpDLxyxA14o3/M238r6+XfHAgbqmE8MpKdwuasZLUM7DsWlXcdyZgfmi:WDLZKa/MtXfHAgbqmEtxsfmyZgfmi
MD5 SHA1 SHA512 SSDEEP

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iBO0xNt6IBMRJR.exe

Path C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\iBO0xNt6IBMRJR.exe
Size 72KB
SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
MD5 3fb36cb0b7172e5298d2992d42984d06
SHA1 439827777df4a337cbb9fa4a4640d0d3fa1738b7
SHA512 6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c
SSDEEP 1536:bvUpDLxyxA14o3/M238r6+XfHAgbqmE8MpKdwuasZLUM7DsWlXcdyZgfmi:WDLZKa/MtXfHAgbqmEtxsfmyZgfmi
MD5 SHA1 SHA512 SSDEEP

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memory/4356-143-0x0000000000400000-0x0000000001552000-memory.dmp

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memory/4356-142-0x0000000000400000-0x0000000001552000-memory.dmp

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memory/4356-147-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/4356-151-0x0000000000400000-0x0000000001552000-memory.dmp

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memory/4356-154-0x0000000000400000-0x0000000001552000-memory.dmp

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memory/5060-132-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/5060-134-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/5060-155-0x0000000000400000-0x0000000000413000-memory.dmp

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